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Soroban, or Japanese Abacus

Description

This wooden instrument has an open frame and is stored in an open wooden box. The frame (which lifts out of the box) has a cross bar and holds 21 parallel bamboo rods. Each rod holds one bead above the cross bar and five below. The beads have a similar shape to those of other Japanese abaci. All the columns of the abacus except the center one are labeled with Japanese characters on the cross bar.

According to the donor,writing found on the back of the cross bar indicates that the abacus was made by Oh Tani (or Oh Ya) in Hiroshima and owned by Yoshizaemon Muraoka of Sakata-ken (a city in northern Japan, which was known by that name from 1871 until 1933, when it became Sakata-shi).

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